Update app.py

app.py

@@ -9,5 +9,6 @@ if uploaded_file is not None:
      dataframe = pd.read_csv(uploaded_file)
      st.write(dataframe)
      series = st.text_input("Write the name of the variable you want to forecast")
-     fig = px.line(dataframe, y=series, title=f'Forecasting {series}')
-     fig.show()
+     if series is not None:    
+          fig = px.line(dataframe, x=dataframe.index,y=series, title=f'Forecasting {series}')
+          fig.show()